Postpartum care in the United States is notoriously anemic. A new mom generally has a six-week check-up during which her OB-GYN or midwife will ask a few basic questions and check whether her uterus has shrunk back down ― and that’s about it.

The consequences of healthcare providers spending relatively little time with postpartum women have been well-documented in terms of missed mental health diagnoses, but the longterm effects on women’s bodies are also profound ― and often...